Hi all,

There are two limitations for current lookup table design:

1. lookup table size is limited, because table snapshot need to be cached in
Kylin server, too large snapshot table will break Kylin server, also the
snapshot building may take very long time when it is too large.
2. each segment has its own lookup table snapshot, but some users may need a
global snapshot table, which means when the global table is updated, the
query for all segments need to reflect the change. 

To resolve the above limitations, I have created ticket: 
https://issues.apache.org/jira/browse/KYLIN-3221
<https://issues.apache.org/jira/browse/KYLIN-3221>  , and put initial new
design doc there, any comments and suggestions are welcome.

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